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Full text of "The Morphology And Evolution Of The Apes And Man"

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The orbicularis oris (fig. *27D has the usual sphincteric arrangement. It is formed as in Man. and it likewise gives off from its deep surface the nrasculi ineisivi, canini and rnentales.
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FIG. 29.—The lips, cheeks and masticatory muscles in the Chimpanzee. B.A. and B.S.G., buccal artery and salivary glands; BUG., buccinator; A.F.V. and T.F.V., anterior and transverse facial vessels ; L.L. and "C.L., lips; I.O.X., L.B.N. and M.B.T., infra-orbital, long buceal and mental nerves ; L.P. and S.P., labial and salivary papillae ; M.I., musculi incisivi; M.M., mentalis muscle: D.P.M. and S.P.M., deep and superficial parts of masseter muscle; S.P.F., suctorial pad of fat; T.M , temporal muscle.
Auricular Muscles.—There are individual variations in each Ape/ and the following arrangements have been seen:—